Rich ard y ose



`1titrh gisten @sind @frn IMPROVED GAR-SPRING.

dits tlgeimlt ttfetteh tu in time tettert atmt zmh mating;A putt riftigt same.

To ALL wHoM I'r MAY ooNcEnN:

v Be it known that I, RICHARD Voss, of the city, county, and State ofNew York, have invented a. new and' useful Improvement in Volute Springs-for Railroad-Cars and other vehicles, and for other purposes; and Idohereby declare the following to be a full and `exact descriptionthereof, referencebeng had to the accompanying drawingsforming a part ofthis specicatiom'iri wl1ich i Figure 1 is an elevation` and Figure 2 a.central longitudinal section of my improved spring, the section, iig'.2,`illustrating a modification of Vthc form of invention shown infig. 1. e v

The nature of my invention consists in the use of a.V baro'f metal,made' thicker at lone edge or side than the other, and tapering, eitherwith a streight face, as illustrated in iig. 1, or with en inward curve,as shown in iig. 2, from the thick to the thinner edge. The decrease in`the thickness of then-bar, transvemsely from side'- 1 to side, (that isto say in the line'of its width,) may -bedisposedwholly upon one face,so as' to approach in its .l

crossfsection the form substantially of a right-angled triangle,or onboth, so as to present in Asuch section substantially the form of anacute-angled triangle, although I do not contemplate reducing thethinner side of the bar in allcascs to a very fine edge or angle. Thebar may be rolled out in this form in its l'ntanufactre byV passing thesaine through between tapering-rolls properly arranged. lp y Inconstructing my improved'springs out of hars of Ametal so formed andshaped, I coil them spirally upon suitable mandrels, so that the thickeredge shall be uppermost in the spring, and temper vthem in the mannerfollowed iu the manufacture of the ordinary forms of volute springs.Although Ind it best to place the thicker edge of the bar uppermost inthe spring, yet I do not confine myself `tovthis arrangement thereof.

In these my improved springs I obtain more surely greater uniformity oftemper than in the form of springs now in use, from the fact that, whenplaced` coiled in the tempering-bath, the tempering-oils come readily incontact with every part of' the metal. I also'obtain, from a reducedweight of metal .in theV spring, the same, vor, in some forms, greaterresilient power thanis found in the ordinary forms of-springs.

Having thus fully-described my invention, I claim as ne\v,and desire tosecure by Letters Patent- A volute spring, formed or constructed vof acoiled metallic bar, whose thickness is-great'er transverselyupon oneedge thereof than at any other pointtherein, substantially as and forthe purpose hereinset forth.`

The foregoing specification of my improved volute spring signed by me,this' eleventh day of September,

-RIOHD VOSE.

Witnesses:

JAMES GILLET, I ALBERT-L. Burma. v

